Parameter Estimation Method of Simple Scattering Point Cone Target Based on Time-Frequency Imaging

Abstract

The invention belongs to the technical field of signal processing, relates to the technology of radar imaging and discloses a simple scattering point cone target parameter estimation method based on time-frequency imaging. The method includes the steps that instantaneous RD images of a cone target are obtained by carrying out time-frequency analysis on a distance pulse pressure echo in the orientation dimension, the gravity centers of the instantaneous RD images are horizontally moved for alignment so as to overcome inaccuracy of previous motion compensation, the echo period is estimated by calculating the correlation coefficient of the instantaneous RD images after the gravity centers are horizontally moved for alignment, cone symmetry parameters are estimated according to echo time-frequency distribution, rotation frequency of a cone is estimated according to the echo period and the cone symmetry parameters, and the height of the cone and the radius of the bottom face of the cone are estimated according to the positions of scattering points in the instantaneous RD images. The simple scattering point cone target parameter estimation method based on time-frequency imaging has the advantages that operation is easy, information of the positions of the scattering points in an image domain is fully utilized, estimation accuracy is high, and the method is not limited by specific models.

Description

technical field [0001] The invention belongs to the technical field of signal processing, relates to radar imaging technology, in particular to a parameter estimation method of a simple scattering point cone target based on time-frequency imaging. Background technique [0002] While the space cone target is flying at high speed in the air, it is also accompanied by micro-motions such as spin to maintain its own stability. Space cone targets often have parts such as fins and grooves, and their echo scattering characteristics can be regarded as echo characteristics of simple scattering points. In the field of broadband radar imaging, the echo signal of the space cone after motion compensation can be compressed in different range frequency points, so that the target can be imaged with high resolution. High-resolution imaging and parameter estimation of space cone targets are of great significance for ballistic missile target recognition. [0003] Tsinghua University's patent ...

AI Technical Summary

Problems solved by technology

This method overcomes the defect that the traditional space-time analysis method cannot make full use of the location information of the scattering points in the image domain and estimate the cone size, and at the same time makes up for the large parameter estimation error caused by the model mismatch of the smooth cone model. insufficient

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